Mum lived in Ireland for over 30 years but held onto her Scottish accent. I would always forget she had a different accent until she met people for the first time and they would always comment on it. Mum never really lost her blás, but whenever she went to Scotland for the weekend to see her family she would come back with a markedly stronger accent than before, a kind of tonality top-up.
After having all of us and living in Ireland for more time than she had lived in Scotland Mum began to identify herself as Irish. She still retained strong links with Scotland, as the majority of her family were still there but she saw Ireland as home. Mum was an Irish woman with a Scottish accent in Ireland, and a Scottish woman with an Irish accent in Glasgow. You cannae win!